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A pulsating impact and hydroforming technology, applied in the field of high-speed material forming, can solve the problems of unmentioned cyclic pulsating impact, cracking, wrinkling, etc., and achieve the effect of reducing equipment requirements, shortening forming time, and improving forming limit.
Active Publication Date: 2016-12-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology
None of the previous studies mentioned the cyclic pulsating impact effect and the regulation function of impact frequency and impact energy. In fact, due to the limitations of materials and size structures, many workpieces are prone to cracks and cracks when they try to form them in place at one time. Wrinkling
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Embodiment 1
[0039] This embodiment takes a typical plate part as an example, combining Figure 2-5 Specific embodiments of the present invention will be described.
[0040] (1) In the parameter setting stage, according to the requirements of materials and parts, the impact frequency, impact energy, and liquid filling volume are formulated; for example, for a metal plate with a thickness of 1mm and a yield strength of 300MPa and an elongation rate of 50%, three impacts are used, each impact energy is 16KJ, and the impact velocity 20m / s, the cavity volume of the required forming part is 2L, the actual working medium is 3L, and the blank holder force is 150t.
[0041] (2) The feeding stage, such as figure 2 , the process is: the plate 4 is placed in the plate mold 5 and positioned;
[0042] (3) Liquid filling stage, such as figure 2 , the process is: according to the command of the control system, filling the liquid medium 3 with a preset volume;
[0043] (4) The first impact stroke, s...
Embodiment 2
[0048] The following takes a typical pipe part as an example, combined with Figure 6-7 The present invention is described in detail.
[0049] Using the above-mentioned pulsating impact hydroforming method, the forming process of the hard-to-form material pipe is the same as the forming process of the plate part in Example 1, wherein the pipe 7 has the same effect as the plate 4, and the pipe mold 8 has the same effect as the plate mold 5.
[0050] In Example 1-2, the parts were obtained by progressive high-energy-rate pulsating impact hydroforming that reasonably distributed the deformation to multiple passes. After testing, the parts did not appear to be cracked or wrinkled, which shows that the method of the present invention can solve the problem very well. Occurrence of workmanship defects.
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Abstract
The invention discloses a high-energy-rate pulse impact hydraulic-forming method and belongs to the field of high-speed formation of materials. According to the high-energy-rate pulse impact hydraulic-forming method, the advantages of high-speed impact forming and the advantages of pulse hydraulic forming are combined, and an impact body which moves at a high speed impacts liquid media repeatedly to complete incremental forming of a part. According to the process of each time of impacting, an impact power source drives the impact body to move at a high speed, the impact body which moves at a high speed impacts the liquid media, the kinetic energy of the impact body is instantly converted into the pressure energy of the liquid media, and thus rapid deformation of a workpiece is completed. According to the method, the overall output energy can be controlled accurately, so that the energy transmission rate, namely energy used for workpiece forming, is controlled accurately, and the required part shape is obtained through multiple times of pulse impact; the deformation of each pass can be controlled accurately, the forming time is short, the strain rate of materials is high (10<3>s<1->-10<4>s<-1>), the forming limit of the materials can be increased, and the mold attaching effect is good; and the high-energy-rate pulse impact hydraulic-forming method can be used for precise formation of magnesium alloy, aluminum alloy, titanium alloy and other alloys difficult to deform.
Description
technical field [0001] The invention belongs to the technical field of high-speed forming of materials, and specifically relates to a high-energy-rate pulsating impact hydroforming method. Background technique [0002] In response to the urgent needs of lightweight, non-residual, high-precision and integrated development of precision parts in key fields such as automobiles, aerospace and nuclear power in my country, the development of complex parts of magnesium, aluminum, titanium and other lightweight alloys has become a promotion It is one of the important issues to be solved urgently for the development of the national economy and the improvement of the national security level. However, the above-mentioned lightweight alloys are hard-to-deform alloys, which are prone to wrinkling and cracking during the forming process, which hinders their wide application. There are three ways to improve the formability of the above-mentioned difficult-to-form materials: warm forming, hi...
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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/021B21D26/033B21D26/06
CPCB21D26/021B21D26/033B21D26/06
Inventor 徐勇马彦张士宏宋鸿武
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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